Our market development work is important to achieving our statutory objective to promote competition in, reliable supply by and the efficient operation of the electricity industry for the long-term benefit of consumers.

If an anomalous event or outcome occurs in the market or the broader electricity sector, we investigate it to determine the causes and whether something can or should be done to prevent such an event or outcome from occurring again.

How does electricity get to my house?

My home

You will have an electricity meter at your house which records the amount of electricity you use.

Retailers

Retailers

Retailers sell electricity to consumers. There are a wide range of retailers and electricity plans available across New Zealand. Check out your options at www.whatsmynumber.org.nz

Retail market

Retail market

We have a competitive retail market which means consumers can freely choose who they want to buy their electricity from. You can check the retail brands available in your area at www.whatsmynumber.org.nz

Distribution

Distribution

Local distribution networks deliver the power to homes and businesses through overhead wires or underground cables. Distribution networks connect to the national transmission grid.

Transmission

Transmission

New Zealand’s national transmission grid is owned and operated by Transpower. The national grid transmits electricity at high voltages (up to 220,000 volts) from where it is generated to the local transmission grid. A few large industrial sites connect directly to the national grid.

Wholesale market

Wholesale market

Electricity retailers buy from the wholesale market. Prices on the wholesale market are calculated every half an hour and vary depending on supply and demand.

Generation

Generation

About 85 per cent of New Zealand’s electricity generation comes from renewable sources. Most of our electricity is generated from hydro-electric stations but there is also gas, geothermal, coal, wind, diesel and solar generation.